Investigation on Delamination Characteristics of 2-Ply Clad Metals and Adhesive Joints for Aluminum/Stainless Steel via the Peel Test

Jun‑Hyung Sim,Yungeun Ha,Min‑Kyun Kim,Min‑Joong Kim,Young‑Rae Cho 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.2

Bonding properties are important for metallic multilayer composites (MMCs) comprising different materials or materialswith different mechanical properties. In this study, we fabricated 2-ply Al/stainless steel (STS) clad metals and Al/adhesive(adh)/STS joints. To manufacture samples with various mechanical properties, T6 heat treatment was performed on cladmetals, and adhesive joints of several thicknesses were prepared. For each sample, the bonding strength was characterizedvia a T-peel test and the results were analyzed using the peeling angle. For 2-ply Al/STS clad metals, the T6 heat treatmentresulted in opposite trends in the mechanical properties. The bonding strength of 2-ply Al/STS clad metals was affectedby the peeling angle, i.e., a small peeling angle provided a small bonding strength at the interface. However, for the 2-plyAl/adh/STS joints, the bonding strength of adhesives on metals depended on each adherend of the stress state. As the differencein mechanical properties between the two adherends increased, the difference in each peeling angle of Al and STSalso increased. The peeling angle of adherends reached a limiting value when the sample contacted the clamping jig head;therefore, a new term, apparent bonding strength (ABS), is necessary to differentiate this new strength from the bondingstrength obtained under non-contact conditions. We believe that the concept of peeling angle and ABS proposed herein willplay a crucial role in describing the delamination behavior and bonding strength of MMCs via the peel test.

Identification of Genes Modulated by High Extracellular Calcium in Coculture of Mouse Osteoblasts and Bone Marrow Cells by Oligo Chip Assay

Kim, Hyung-Keun,Song, Mina,Jun, ji-Hae,Woo, Kyung-Mi,Kim, Gwan-Shik,Baek, Jeong-Hwa The Korean Academy of Oral Biology 2006 International Journal of Oral Biology Vol.31 No.2

Calcium concentration in the bone resorption lacunae is high and is in the mM concentration range. Both osteoblast and osteoclast have calcium sensing receptor in the cell surface, suggesting the regulatory role of high extracellular calcium in bone merabolism. In vitro, high extracellular calcium stimulated osteoclastogenesis in coculture of mouse osteoblasts and bone marrow cells. Therefore we examined the genes that were commonly regulated by both high extracellular calcium and 1,25(OH)_(2)vitaminD_(3)(VD3) by using mouse oligo 11 K gene chip. In the presence of 10 mM[Ca^(2+)]e or 10 nM VD3, mouse calvarial osteoblasts and bone marrow cells were co-cultured for 4 days when tartrate resistant acid phosphatase-positive multinucleated cells start to appear. Of 11,000 genes examined, the genes commonly regulated both by high extracellular calcium and by VD3 were as follows; 1) the expressions of genes which were osteoclast differentiation markers or were associated with osteoclastogenesis were up-regulated both by high extracellular calcium and by VD3; trap, mmp9, car2, ctsk, ckb, atp6b2, tm7sf4, rab7, 2) several chemokine and chemokine receptor genes such as sdf1, scya2, scyb5, scya6, scya8, scya9, and ccr1 were up-regulated both by high ectracellular calcium and by VD3, 3) the genes such as mmp1b, mmp3 and c3 which possibly stimulate bone resorption by osteoclast, were commonly up-regulated, 4) the gene such as c1q and msr2 which were related with macrophage function, were commonly down-regulated, 5) the genes which possibly stimulate osteoblast differentiation and/or mineralization of extracellular matrix, were commonly down-regulated;slc8a1, admr, plod2, lox, fosb, 6) the genes which possibly suppress osteoblast differentiation and/or mineralization of extracellular matrix, were commonly up-regulated;s100a4, npr3, mme, 7) the genes such as calponin 1 and tgfbi which possibly suppress osteoblast differentiation and/or mineralization of extracellular matrix, were up-regulated by high extracelluar calcium but were down-regulated by VD3. These results suggest that in coculture condition, both high extracellular calcium and VD3 commonly induce osteoclastogenesis but suppress osteoblast differentiation/mineralization by regulating the expression of related genes.

인공지능 기반 가상 비서의 BIM 설계 적용에 관한 기초연구

김형준(Kim, Hyung?Jun),전한종(Jun, Han-Jong) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.1

In this research, in order to solve the problem of degradation of business efficiency of building design utilizing BIM, a process was constructed using virtual assistant based on artificial intelligence technology. In the constructed process, the designer can learn the command customized to the virtual assistant applied to the BIM architecture design work, using the A-BIM algorithm. These A-BIM algorithms are utilized in the form of artificial intelligence algorithms built in the understanding structure of the designer. As a result, it is expected that the efficiency of operations can be improved by fusing the conventional artificial intelligence technology and the A-BIM algorithm, rather than developing artificial intelligence to be applied to the field of BIM architectural design.

김치에서 분리한 Lactobacillus sp. JC-7과 Lactobacillus acidophilus 88간의 Electrofusion 최적조건 설정

조영배,최현정,백형석,전홍기 부산대학교 유전공학연구소 1997 분자생물학 연구보 Vol.13 No.-

김치 발효 숙성기간을 연장하고 신선도를 오랫동안 유지 할 수 있는 김치발효 starter의 개발을 목적으로 최적숙성기에 있는 김치로부터 bacteriocin생성능이 없는 유산균을 분리하여 동정하였으며, bacteriocin생성능이 우수한 L.acidophilus 88을 융합시키기 위해 electrofusion에 대한 최적 조건을 검토하였다. 분리균주는 Lactobacillus속으로 동정되어 Lactobacillus sp. JC-7이라 명명하였다. Electrofusion에 의해 생성된 융합주를 식별하기 위해 streptomycin(2.5㎎/ml)에 내성을 나타내는 Lactobacillus sp. JC-7변이주와 kanamycin(600㎍/ml)에 내성을 나타내는 L.acidophilus 88변이주를 분리하였다. Electrofusion을 100V/㎝, 120msec(72ohms,1670 capacitance) 에서 수행했을 때 융합효율이 가장 양호하였으며 전기장의 세기와 시간이 중가할수록 융합 효율이 현저히 감소하였다. 2가 양이온은 농도가 중가할수록 대체적으로 융합효율을 감소시키는 경향을 나타내었으나 1mM MGCl_2에서는 대조군에 비해 융합효율이 약간 증가하였다. PEG매개에 의한 융합법의 융합효율을 비교한 결과, 융합효율은 chemical fusion<electrofusion<electrofusion+20% PEG순을 나타내었다. Evaluation of Optimum Conditions for the Electrofusion between Lactobacillus sp. JC-7 Isolated from Kimchi and Lactobacillus acidophilus 88. Young-Bae Jo, Hyun-Jung Choi, Hyung-Suk Baik and Hong-Ki Jun*. Department of Microbiology, Pusan National University, Pusan 609-735,Korea-A lactic acid bacterium was isolated from kimchi. The isolated strain was identified as the genus Lactobacillus thrugh its morphological characteristics and named as Lactobacillus sp. JC-7. The optimum conditions for the electrofusion between streptomycin(2.5㎎/ml)resistant mutant of Lactobacillus acidophilus 88 and kanamycin(600㎍/ml) resistant mutant Lactobacillus sp. JC-7 were evaluated. The highest number of fusants were obtained at a capacitance value of 120msec(1670㎌), a field strength of 100V/㎝,and a pulse controller setting of 72Ω. The potimum pH of elecroporation buffer was 7.5 and the concentration of divalent cation was 1mM MG^2+. Electrofusants were efficiently obtained by addition 20% polyethylene glycol to electroporation buffer. The yield of fusion was better than that of using polyethylene glycol mediated chemical induction.

제 3 대구치 발치시 환자의 호흡 패턴이 스트레스 변화 양상에 미치는 영향

이상명,김형욱,박양호,김진철,박준우,이성준,안재목,Rhee, Sang-Myung,Kim, Hyung-Wook,Park, Yang-Ho,Kim, Jin-Cheol,Park, Jun-Woo,Rhee, Sung-Jun,Nyamdorj, Selenge,Ahn, Jae-Mok 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.5

Purpose: Heart rate variability(HRV) is the clinical consequence of various influences of the autonomic nervous system(ANS) on heart beat. HRV can estimate the potential physiologic rhythm from the interval between consecutive beats(RR interval or HRV data). It is known as RSA which represents respiration-related HR rhythmic oscillation. Previous studies demonstrated a specific breathing pattern(0.1Hz, 6breaths/min) to improve a physiological body condition related to the stress. In this paper, the level of stress would be evaluated in terms of three phases of the dental treatment, combined with 6breaths/min. Methods: These phases include before, during and after tooth extraction or anesthesia or something.36 patients' stresses were assessed using HRV stress analyzer in each phase in Kangdong Sacred Heart Hospital, and Chuncheon Sacred Heart Hospital, Hallym University Medical Center from Jun. to Sept. of 2007. HRV 5-min data collected were analyzed in time-domain and frequency-domain to evaluate the activity of autonomic nervous system(ANS) which represents the level of stress. Results: All HRV parameters including HF(high frequency), LF(low frequency) and LF/HF ratio showned a significant change affecting the ANS balance. There was a 6.4% difference between R(LF/HF)s on general breathing pattern for balance of Autonomic nervous system, but on controlled breathing pattern, 0.1Hz, was made narrow till 1.4%. The activity of ANS has increased by 1.4% on general breathing pattern, and by 2.9% on controlled breathing pattern, 0.1Hz. Conclusion: After analysis of preoperative stress changes and effect of breathing pattern of 0.1 Hz on the stress in 36 patients who have undergone third molar extraction, following was concluded. In the preoperative stage, the sympathetic change was the greatest?after the?anesthetic injection, and stress was relieved by controlling the breathing pattern to a frequency of 0.1Hz.

행정윤리로서의 사회적 형평성에 관한 이론적 고찰 : 복지정책과 이념정립 모색 A Search for Establishing the Ideology of Welfare Policy

전형원,함우식 군산대학교 지역개발연구소 1991 地域開發硏究 Vol.3 No.-

용사코팅용 나노 WC-12Co 피드스톡의 제조

전형우,김주선,박준영,박종구,황순영,이해원 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.4

This study investigates the fabrication of WC-12Co feedstock powders with weakly locculated slurries by spray drying under various conditions. The morphological defects and flocculation states according to the amount of additives are evaluated to prepare spherical WC-Co feedstock powders with little morphological defects and homogeneous microstructures. The characteristics of feedstock powders, heat treated between 850-1200℃, are analyzed via SEM, EPMA, and mercury porosimetry. The results showed that with the increase in heat treatment temperature the portion of larger pores around 10 μm increased while, that of smaller pores of 1 μm lessened due to the coalescence of WC particles, forming dense feedstock powders with little defects such as hollow or craters. The feedstock heat treated at 1200℃ showed a porosity of 42.2% and a density of 8.28 g/cm^(3) as well as uniform distribution of pores and Co. (Received January 19, 2004)

공공정책평가의 평가활용에 관한 이론적 고찰

전형원 군산대학교 지역개발연구소 2000 地域開發硏究 Vol.12 No.-

A Syntactic Analysis of Passive Forms with Modifiers(Ⅱ)

全炯國 연세대학교 인문과학연구소 1964 人文科學 Vol.11 No.-

A. The frequency of the use of active forms is higher than that of passive forms. The investigation shows that the passive forms are used not as a matter of the writer's taste but as a consequence of the contents of his work. B. Modifiers of passive forms include are many prepositional phrases such as by-phrases, to-phrases in-phrases. This would seem to indicate that very often passive forms do not convey the characteristic of passive verbs. C. Common nouns are usually used as the subjects of passive verbs. You and we are not used as much as I and he. D. In most cases of passive forms it is an ordinary occurrence for a few sentences to allow function words to intervene between the verb be and past participle. E. In connection with the tense the past tense is more common than that of future and present. F. The list of passive verbs is shown in order to define the pattern of occurrence of passive forms.

A Syntactic Analysis of Passive Forms with Modifiers (Ⅰ)

全炯國 연세대학교 인문과학연구소 1963 人文科學 Vol.10 No.-

The method I have used here has been to record all the forms that appear in thirty-one short stories and then to group them in ccordance with their grammatical forms. Statistical study of the occurrence of active and passive forms in the limited materials shows that the passive forms are used not as a matter of the author's taste but as a consequence of the contents of his work. Certain words, phrases and modifiers cluster around the passive form. The position of the modifiers can be classified into three types: post-posted modifiers, pre-posted modifiers, and interjected modifiers. In analysing the modifiers of the passive form we consider the prepositional phrases which are post-posted modifiers to the passive form. When the post-posted modifiers begin with prepositions, two-way classification can be made-into free form and bound from. The free form stands independently but the bound form does not. Four additional items of analysis in connection with passive forms will be discussed in the next issue.